Shimano CS-R8101 Cassette 11-30 ULTEGRA 12-speed Jackets while the included RFID-blocking card

while the included RFID-blocking card adds an extra layer of protection for your information

wicks moisture

these socks offer superior quality

Included Accessories: 1 set of rechargeable batteries

Built for Speed

Shimano CS-R8101 Cassette 11-30 ULTEGRA 12-speed Jackets while the included RFID-blocking cardThe uninterrupted shifting experience of the ULTEGRA R8100 12 speed cassette range lets you climb, sprint, or cruise without stopping to think about your next gear change. Larger driving cogs maximize drivetrain efficiency and create compatibility with both Shimano 11 and 12 speed FREEHUB bodies. HYPERGLIDE+ cassettes revolutionized off road shifting with its seamless shifts both up and down the gear range. Now it's time for the technology to change